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Spectradyne LLC, All rights reserved
36
Version 2.5.0 Revision 3, July 2020
Quantifying Particle Size Distributions
–
Fitting Gaussian Peaks in the CSD
➢
Peaks in the CSD can be fit to a normal distribution to obtain the mean and width of the
peak (Figure 19):
❖
In the Quantification tab of the Viewer, select the size range of interest either
graphically or by manually entering the minimum and maximum values
❖
Click “
Gaussian Fit
” to fit the selected region to
a normal distribution.
❖
Fit results and the concentration of particles over the fit range are displayed on the
plot
Quantifying Particle Size Distributions
–
D-values in the CSD
➢
The D10, D50, D90 values corresponding to 10%, 50%, and 90% of particles are available
for display on the CSD:
❖
In the Quantification tab of the Viewer, select the size range of interest either
graphically or by manually entering the minimum and maximum values
❖
Click “D10, D50, D90” to
display the D-values over the fit range on the plot
The above quantification methods perform the same functions when plotting multiple CSDs
(multi-mode). The CSD corresponding to the file selected in the Currently Loaded Files dropdown
is the one that is measured.
Subtract CSDs
➢
View and export the subtraction of one CSD from anothe
r (e.g., subtract a ‘blank’)
➢
See the Data Export section on page 36 for more details.
Figure 19.
Quantification of a CSD plot. The peak is fit to a Gaussian distribution and the
concentration of particles in the range of 200-300 nm is measured directly.